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Hi,

I should probably do a send-pr on this one but I would like to get some 
feedback before I do that. (Maybe there are some more things I should 
try or more data that should be included in a pr, etc.)

We have two Mac QuickSilver 2002 running 1.6 -current (4 days old) that 
we have a problem with the NFS-clients on. The really strange thing is 
that it is only one file that we have this problem with. But it doesn't 
matter if one copies the file to another place on the same NFS-server or 
even to anther NFS-server. The symptoms are that when one tries to read 
the file (using dd, hexdump, cp or what ever) over NFS on anyone of the 
Macs the reading process will just stall and after a minute or so the 
following error message appear:
    nfs server 192.168.1.246:/export: not responding
After that the process will still be stalled and the NFS-mount in 
question will be inaccessible for the whole system. After experimenting 
a bit I noticed that if one was quick enough one could overwrite the 
file with zeros (on the server-side) and the stalling process would get 
going again and the error message would not appear.

I've tried putting the file on three different NFS-servers, one running 
NetBSD 1.6 -current, one running FreeBSD 4.6 and one running Linux, and 
the problems remains the same. I've used other NFS-clients (NetBSD 1.5.2 
on i386, FreeBSD 4.6 and Linux) and they can read the file without any 
problems. This leads me to belive that the bug is in the NetBSD -current 
NFS-client (or some of its subsystems, RPC?).

The file was originally a regualar tar-gz file (2.6MB) but I truncated 
it and filled partly with zeros from the start of the file until it 
looked like this (this is a hexdump -C, it's also available in binary 
format on http://195.163.5.2/badfile.bin):

00000000  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  
|................|
*
0002bc50  00 00 00 00 00 00 00 00  00 00 f6 89 d9 ba 96 7d  
|...............}|
0002bc60  37 60 43 70 e8 7d aa ba  f3 49 f0 77 80 b5 48 fe  
|7`Cp.}...I.w..H.|
0002bc70  fc ac fd 01 fc 66 04 f0  be 54 74 bc ba 6d d2 8e  
|.....f...Tt..m..|
0002bc80  72 dd f7 03 87 6c 3b a4  d5 e8 3f                 |r....l;...?|
0002bc8b

If I truncate it any more or fill it with any more zeros the problem 
goes away. So this leaves us with 49 bytes of file data that somehow 
cause our NFS-client to fail. I also tried moving these 49 bytes to the 
begining of the file but that also made problem go away. (I also tried 
zeroing out some bytes in different places in the middle of this block 
and sometimes the problem went away and other times not, so appearently 
all 49 bytes are not relevant to the problem).

nfsstat does not report any errors but the RPC retries count goes up 
when one tries to read the file.

I should also say that I didn't use any special agruments to mount_nfs 
(nor to nfsd on the servers).

To me this is a very strange problem, I didn't think the content of a 
file could somehow effect the NFS-protocol but obviously it does.

Anything more I should try? Is there any more information I should 
include before I do a send-pr?

(It would be interesting to see if someone could reproduce this, maybe 
on some other arch than macppc.)

/Erik




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